Photochromic nanomaterial capable of blocking ultraviolet rays and preparation method and applications thereof

Abstract

The invention provides a photochromic nanomaterial capable of blocking ultraviolet rays having a general formula of MaObXc and a preparation method and applications thereof, wherein the M, O, X, a, band c are defined in the description. The nanomaterial can be prepared by the following method: heating a mixture of cationic source compounds containing the M, polyols, surfactants and first solventsunder stirring to obtain a hot first solution; mixing anion source compounds containing the X and second solvents to obtain a second solution; injecting the second solution into the first solution for reaction to obtain a reaction mixture; and post-treating the reaction mixture. The nanomaterial of the invention can block more than 80% of ultraviolet rays, become transparent dark especially whenirradiated by strong light to reduce the transmittance, and turn back to a colorless transparent state when not irradiated by strong light. In addition, the photochromic nanomaterial and the preparation method of the invention have the characteristics of simple process flow, low cost and large output, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of photochromic materials, in particular to a photochromic nanometer material capable of blocking ultraviolet rays, a preparation method and application thereof. Background technique [0002] Photochromism refers to the chemical reaction of certain compound materials under the action of light of a certain wavelength and intensity, resulting in changes in the structure of the compound, causing the color of the compound to change, after the light is removed or irradiated by another wavelength and intensity of light , the color recovers or a new change occurs. Since the 1950s, when Hirshberg et al. reported the possibility of photochromic application in optical recording and storage, the performance and application of various new photochromic materials have been systematically studied and widely used in building window glass. , color-changing glasses lenses, vehicle window glass, information storage materials, decorativ...

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Problems solved by technology

However, these technical processes use expensive raw materials such as Ag, Au, Nb, etc., which cannot meet the requirements of industrial production on production costs.

[0005] In addition, the literature (Acta Synthetic Crystallography, 2014, 43(12), 3113-3117.) reported photochromic WO 3 -TiO 2 -The preparation method of ZnO sol needs to prepare WO separately first 3 、TiO 2 and ZnO sol, and then mix the three in a certain proportion; it needs to be irradiated with a 500W mercury lamp to change color, and it takes 6 hours to recover colorless after no light, the color change efficiency is low, and the above-mentioned technical operation is cumbersome

Similarly, literature (Technical Physics Letters, 2009,35(10):909-911.) reported the use of WO on CuCl films 3 Vapor deposition, prepared CuCl-WO 3 Composite film material with double-layer structure, using WO 3 It can photolyze the properties of molecules containing hydrogen atoms such as water molecules, and release hydrogen atoms. After the hydrogen atoms touch the surface of CuCl, it will trigger CuCl to exhibit photochromic properties. The reaction mechanism is complicated, the color changing efficiency is low, and the preparation technology is relatively harsh.

[0006] In summary, it can be seen that the existing photoluminescent materials have high cost of raw materials and complicated process technology, which cannot meet the economic requirements of industrial production, which hinders the development of photochromic materials in commercial applications.

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